Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Reexamination Certificate
2005-05-03
2005-05-03
Kwok, Helen C. (Department: 2856)
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
C073S024010
Reexamination Certificate
active
06886412
ABSTRACT:
An ultrasonic-wave propagation-time measuring method and gas concentration sensor are disclosed in which a reception wave which has been transmitted and received by an ultrasonic element5is subjected to full-wave rectification in order to obtain a full-wave-rectified wave, which is then integrated by an integration circuit37to obtain an integral value. A peak value of the integral value is held by a peak-hold circuit39. As to detection of gas concentration, a threshold-level calculation section21esets a reference value on the basis of the peak value, and a point in time when the amplitude of a reception wave having undergone full-wave rectification is judged by a comparator43to have reached the reference value is regarded as an arrival time. Subsequently, a gas concentration is determined on the basis of a period between the emission time and the arrival time.
REFERENCES:
patent: 4022058 (1977-05-01), Brown
patent: 4515021 (1985-05-01), Wallace et al.
patent: 4538469 (1985-09-01), Lynnworth et al.
patent: 6418782 (2002-07-01), Sato et al.
patent: 6568240 (2003-05-01), Sato et al.
patent: 6568281 (2003-05-01), Sato et al.
patent: 1077365 (2001-02-01), None
patent: 60-502171 (1985-12-01), None
patent: 5-72527 (1993-10-01), None
patent: 9-318644 (1997-12-01), None
Banno Keigo
Ishida Noboru
Ishikawa Hideki
Oshima Takafumi
Sato Yoshikuni
Kwok Helen C.
NGK Spark Plug Co. Ltd.
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